Maybe the 400 is the worst - One of the worst sessions I know for sprinters is 2x3x150m 90% walk back recovery 5 mins between sets - your guaranteed to at look very white 
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I can unload for a minute (or less) to the point where my legs are seized up at the end, but I recover from that pretty quickly. Make it a ~two-minute effort with that same emptying sensation and Iām done for a while. 
800 is the worst. And even worse, you prep for it by doing a bunch of reps of everything from 200s-1200s which is just awful. Why did I do that event?
Nearly 14 years of XC/Indoor/Outdoor/Road and I only puked once. Another 1-2 times were close calls. Cycling never brought me to that point. It has brought me to eye crossing, leg blocking exhaustion where I almost fell off the bike but no vomit yet.
It has always seemed like some people are more prone.
I also would not compare most people to an Olympic gold medalist. Not sure if that has anything to do with it but it might, even if everyone you were comparing was prone to getting sick.
Good luck on not puking, everyone.
Same here, I never puked nor felt I was ever close. I was on the floor, gasping for air, yes, sure. But I never felt like I was about to vomit.
In high school after the 400m a few times. Only once cycling when I did a 4min all out effort on the trainer that I tapered down for (for bragging rights!). Otherwise, never, but probably bc I donāt try that hard and that kind of effort is crazy to be doing as a (serious) hobby exerciser! lol
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I agree about the 800m running race. I was a 1500, 3000, and 5k racer on track but I was made to race 800 when my team mate pulled out sick before the start.
It was hell, and the one and only time i almost lost control of my bladder
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I remember a time when I was on the āreservesā for this bigger meet which only allowed one or two per event, so I was the third option in the 800. Figuring I wouldnāt run, a few of us āreservesā went and ran a popular/big half marathon in our city in the morning, against the coachās wishes.
Fortunately, I ended up not having to run a race. Unfortunately, the coach found out that I and two other āreservesā had run the half that morning. So he came to us after our warmup period and said, he knew what we did, and we were going to go run a 400 during the meet break. If we didnāt go under 1:00 we were in trouble (he threatened some terrible thing). I beat that time, ran a 56, not terrible, but I remember being distinctly happy that he hadnāt said āYouāre gonna run an 800 and if you canāt go sub-2:00 Iāll take away your birthdayā or whateverā¦ because I wouldāve popped in the last 150 and probably walked it in.
Itās āeasyā to unload sugar for a minute like the 400. Itās that last 20s or so in the 800 where your legs are totally cooked and you actually have to accelerateā¦
Running cross country races for my club as a kid, my technique was always to swallow my own vomit back down again so as ānot to show weaknessā in front of the opposition.
How I used to love that experience. 
Although the 800m is my favourite track event to watch, I think it would be my least favourite to try.
In that particular race, the 2024 Olympics womens final, there was no chance KH was letting anyone past her once she got on the front at about 220m in. A good display imo.
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Uggā¦ Iām no competitive rider, but Iāve trained so hard that Iāve almost hurled. Generally, on or off the bike, Iād rather die than puke, so training hard enough to hurl is not a pleasant feature, but I donāt tend to avoid tough workout either. At least in previous years.
How many people have had chest pain riding? I got used to it, thinking it was an interstitial muscle in my rib cage, but mentioned it, and got a workup. Interesting resultsā¦
Ever try the steeple chase? Feels like an 800 but for 3k 
Seriously thoughā¦ 400 and 800 are by far the hardest races on the track. I saw a kid run so hard in the 400 (he was anchor in the 4x400 and was in a three-way battle for the league championship) it literally took him 20 minutes until I think he had enough oxygen in his brain where he could function again.
But 400 has nothing on making you throw up like an all-out 800 though!
As a 400/800m coach and a former 400m runner my opinion is that the 400m is definitely worse than the 8 when it comes to āthrowing upā 
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I used to mark my territory all the time out on the trail, when I didnāt know about bonking and how to eat/drink while riding. Now that Iāve got nutrition dialed in, actual puke is very rare, but I do still get queasy and even a little dry-heavy with certain workouts. There was a TR block a year or two ago where I kept a little plastic trick-or-treating pumpkin near the trainer, just in case. 
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Iāve always said I thought steeplechase was dumb.
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Not a puker but definately gone that hard. Sometimes my face/extremities go numb especially after a tough cx race or crit finish. I have passed out after a sprint so it must be a personal thing relating to nervous system stimulation/blood flow.
been there 2 timesā¦
First time was during a fitness test in a gym, it was HIIT until failureā¦ I definitely failed in the endā¦
The last time was during a 240km ride, never did this before, my stomach could not handle the carbs that i was eating/drinking with all the gels/isotone drinks etcā¦
But i finished 
Iām concerned because passing out is not a common symptom for riding/running. That sounds like a possible cardiac issue. I was having slight chest pain and found out that I had a genetic condition where one of the major vessels in my heart was under sized. All my plumbing was plaque free, but that one vessel meant that I had a governor that was trying to tell me I was at my max. Crazyā¦
The following workout for my 400m runners tended to produce the most nausea:
Split 400 (250 + 150, standing starts, 1min rest), with 250m @400m pace and 150m @ 100%
-20min rest
Split 400
-20min rest
150m @ 100%
(The total time of the 2nd split 400m was also a good predictor of 400m race time.)
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I definitely pull the plug on a lot of 3rd sets in workouts but luckily have never thrown up. I actually think itās really mentally important to not collapse epically after your workout like some tour de lāavenir neopro going for their first pro contract in a mountains stage breakaway sprint finish. Always at least recover to z2, donāt collapse
The closest I have gotten I actually got off the bike and prepared another very sweet bottle in the rest interval and hit the 3rd set of 30/30s or maybe they were 45/45s doing something like 3 bottles for the hour workout 4-5 tablespoons of gatorade powder + some monster energy in each.
The GI discomfort was real and I felt super nauseous at the end so I just ran out into the snow and lay down.